Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d04e8631f9e1f13…

MALICIOUS

PDF

80.3 KB Created: 2021-04-18 09:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cface8a6c10ff2560bb1222946d7ae8 SHA-1: d0a17aa548d3e4f21b41e77845d0ac79047fb5f1 SHA-256: 4d04e8631f9e1f13e5fcc11f22defcc21536624af87f283e21a9427b88c1b8c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains an embedded external URI pointing to 'https://dugedepap.ru/strik?utm_term=what+are+some+good+argumentative+topics', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL and the high risk score suggest the primary intent is to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=what+are+some+good+argumentative+topics
    • https://cdn.sqhk.co/govazofaj/ADuidgh/splendor_shop_online_gene.pdf
    • https://static.s123-cdn-static.com/uploads/4426960/normal_5fed26723c0e9.pdf
    • https://cdn.sqhk.co/zupuguvawaj/eLibKqL/afcat_2018_admit_card.pdf
    • https://cdn-cms.f-static.net/uploads/4458839/normal_60336f0e83b79.pdf
    • https://static.s123-cdn-static.com/uploads/4382780/normal_5fdd81cf8b518.pdf
    • https://cdn-cms.f-static.net/uploads/4376857/normal_603540f1178d9.pdf
    • https://cdn.sqhk.co/zidexamuwela/mijjgdY/49700027487.pdf
    • https://cdn.sqhk.co/dulidara/hpcxzge/abida_khanam_naat.pdf
    • https://cdn-cms.f-static.net/uploads/4369308/normal_603e4d0a7e545.pdf
    • https://cdn.sqhk.co/numepisu/JhdzhjD/44790527015.pdf
    • https://cdn-cms.f-static.net/uploads/4473656/normal_6019d8b823fd8.pdf
    • https://cdn.sqhk.co/livefivepa/FkxicJJ/36508342313.pdf
    • https://cdn.sqhk.co/zikegasenar/ihjCgfr/ios_screen_recorder_download_apk.pdf
    • https://cdn.sqhk.co/nosilaxuziz/bggUBjd/46989334500.pdf
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fc6f53de8919.pdf
    • http://kopumiwabetare.66ghz.com/53844955189.pdf
    • https://cdn.sqhk.co/lomasamube/0Bjjaje/run_run_rudolph_chuck_berry_chords.pdf
    • https://cdn.sqhk.co/besuduxikuvo/bjjIai7/xadux.pdf
    • https://cdn.sqhk.co/juvanejejuwo/qjeigJt/91660525517.pdf
    • https://cdn.sqhk.co/wukatigubo/ChjUjit/dubunatulimabibuseduvuz.pdf
    • https://cdn.sqhk.co/mudifuto/TgiLOhf/50183487610.pdf
    • https://cdn.sqhk.co/rewakevutel/bjeKhgi/69950605326.pdf
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5fd0b5e6a988e.pdf
    • http://gelivebun.22web.org/zijinuxofaperosogebawiwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suboxasolu.rf.gd/ruzubaw.pdf
    • http://zadiriza.rf.gd/angularity_number_test.pdf
    • http://meluromotav.rf.gd/slope_intercept_form_l_g.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba2.bin
65adda14d7e36924d58b51666af4e8487539924a97f90d0c1cab0f7657d54745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 5528 bytes
font_01_sfnt_off00010e57.bin
ecb1592e09c2a0ab1e2199307cdcab94836f420161e730d1597da1af690474e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 10892 bytes

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